- Acid wash baseball cap,100% Cotton twill,Unconstructed,Metal button back.close.
- The material are the high quality cold steeling rolling plate, surface processing with degrease, acid washing, phosphating , static spraying plastic.
- Cold coiler is used cold roll strap steel unit and acid washing, anneal, cutting, coating of strap steel.
- The deashing of coal was studied under atmo-sphere with alkali treatment followed by acid washing.
- The limestone pieces were given an antique look with a unique finish of sandblast and acid wash.